1 /*
2 * LG.Philips LB035Q02 LCD Panel driver
3 *
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
6 * Based on a driver by: Steve Sakoman <steve@sakoman.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
11 */
12
13 #include <linux/module.h>
14 #include <linux/delay.h>
15 #include <linux/spi/spi.h>
16 #include <linux/mutex.h>
17 #include <linux/gpio.h>
18 #include <linux/gpio/consumer.h>
19
20 #include "../dss/omapdss.h"
21
22 static const struct videomode lb035q02_vm = {
23 .hactive = 320,
24 .vactive = 240,
25
26 .pixelclock = 6500000,
27
28 .hsync_len = 2,
29 .hfront_porch = 20,
30 .hback_porch = 68,
31
32 .vsync_len = 2,
33 .vfront_porch = 4,
34 .vback_porch = 18,
35
36 .flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |
37 DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_SYNC_NEGEDGE |
38 DISPLAY_FLAGS_PIXDATA_POSEDGE,
39 /*
40 * Note: According to the panel documentation:
41 * DE is active LOW
42 * DATA needs to be driven on the FALLING edge
43 */
44 };
45
46 struct panel_drv_data {
47 struct omap_dss_device dssdev;
48 struct omap_dss_device *in;
49
50 struct spi_device *spi;
51
52 struct videomode vm;
53
54 struct gpio_desc *enable_gpio;
55 };
56
57 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
58
lb035q02_write_reg(struct spi_device * spi,u8 reg,u16 val)59 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
60 {
61 struct spi_message msg;
62 struct spi_transfer index_xfer = {
63 .len = 3,
64 .cs_change = 1,
65 };
66 struct spi_transfer value_xfer = {
67 .len = 3,
68 };
69 u8 buffer[16];
70
71 spi_message_init(&msg);
72
73 /* register index */
74 buffer[0] = 0x70;
75 buffer[1] = 0x00;
76 buffer[2] = reg & 0x7f;
77 index_xfer.tx_buf = buffer;
78 spi_message_add_tail(&index_xfer, &msg);
79
80 /* register value */
81 buffer[4] = 0x72;
82 buffer[5] = val >> 8;
83 buffer[6] = val;
84 value_xfer.tx_buf = buffer + 4;
85 spi_message_add_tail(&value_xfer, &msg);
86
87 return spi_sync(spi, &msg);
88 }
89
init_lb035q02_panel(struct spi_device * spi)90 static void init_lb035q02_panel(struct spi_device *spi)
91 {
92 /* Init sequence from page 28 of the lb035q02 spec */
93 lb035q02_write_reg(spi, 0x01, 0x6300);
94 lb035q02_write_reg(spi, 0x02, 0x0200);
95 lb035q02_write_reg(spi, 0x03, 0x0177);
96 lb035q02_write_reg(spi, 0x04, 0x04c7);
97 lb035q02_write_reg(spi, 0x05, 0xffc0);
98 lb035q02_write_reg(spi, 0x06, 0xe806);
99 lb035q02_write_reg(spi, 0x0a, 0x4008);
100 lb035q02_write_reg(spi, 0x0b, 0x0000);
101 lb035q02_write_reg(spi, 0x0d, 0x0030);
102 lb035q02_write_reg(spi, 0x0e, 0x2800);
103 lb035q02_write_reg(spi, 0x0f, 0x0000);
104 lb035q02_write_reg(spi, 0x16, 0x9f80);
105 lb035q02_write_reg(spi, 0x17, 0x0a0f);
106 lb035q02_write_reg(spi, 0x1e, 0x00c1);
107 lb035q02_write_reg(spi, 0x30, 0x0300);
108 lb035q02_write_reg(spi, 0x31, 0x0007);
109 lb035q02_write_reg(spi, 0x32, 0x0000);
110 lb035q02_write_reg(spi, 0x33, 0x0000);
111 lb035q02_write_reg(spi, 0x34, 0x0707);
112 lb035q02_write_reg(spi, 0x35, 0x0004);
113 lb035q02_write_reg(spi, 0x36, 0x0302);
114 lb035q02_write_reg(spi, 0x37, 0x0202);
115 lb035q02_write_reg(spi, 0x3a, 0x0a0d);
116 lb035q02_write_reg(spi, 0x3b, 0x0806);
117 }
118
lb035q02_connect(struct omap_dss_device * dssdev)119 static int lb035q02_connect(struct omap_dss_device *dssdev)
120 {
121 struct panel_drv_data *ddata = to_panel_data(dssdev);
122 struct omap_dss_device *in;
123 int r;
124
125 if (omapdss_device_is_connected(dssdev))
126 return 0;
127
128 in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
129 if (IS_ERR(in)) {
130 dev_err(dssdev->dev, "failed to find video source\n");
131 return PTR_ERR(in);
132 }
133
134 r = in->ops.dpi->connect(in, dssdev);
135 if (r) {
136 omap_dss_put_device(in);
137 return r;
138 }
139
140 init_lb035q02_panel(ddata->spi);
141
142 ddata->in = in;
143 return 0;
144 }
145
lb035q02_disconnect(struct omap_dss_device * dssdev)146 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
147 {
148 struct panel_drv_data *ddata = to_panel_data(dssdev);
149 struct omap_dss_device *in = ddata->in;
150
151 if (!omapdss_device_is_connected(dssdev))
152 return;
153
154 in->ops.dpi->disconnect(in, dssdev);
155
156 omap_dss_put_device(in);
157 ddata->in = NULL;
158 }
159
lb035q02_enable(struct omap_dss_device * dssdev)160 static int lb035q02_enable(struct omap_dss_device *dssdev)
161 {
162 struct panel_drv_data *ddata = to_panel_data(dssdev);
163 struct omap_dss_device *in = ddata->in;
164 int r;
165
166 if (!omapdss_device_is_connected(dssdev))
167 return -ENODEV;
168
169 if (omapdss_device_is_enabled(dssdev))
170 return 0;
171
172 in->ops.dpi->set_timings(in, &ddata->vm);
173
174 r = in->ops.dpi->enable(in);
175 if (r)
176 return r;
177
178 if (ddata->enable_gpio)
179 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
180
181 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
182
183 return 0;
184 }
185
lb035q02_disable(struct omap_dss_device * dssdev)186 static void lb035q02_disable(struct omap_dss_device *dssdev)
187 {
188 struct panel_drv_data *ddata = to_panel_data(dssdev);
189 struct omap_dss_device *in = ddata->in;
190
191 if (!omapdss_device_is_enabled(dssdev))
192 return;
193
194 if (ddata->enable_gpio)
195 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
196
197 in->ops.dpi->disable(in);
198
199 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
200 }
201
lb035q02_set_timings(struct omap_dss_device * dssdev,struct videomode * vm)202 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
203 struct videomode *vm)
204 {
205 struct panel_drv_data *ddata = to_panel_data(dssdev);
206 struct omap_dss_device *in = ddata->in;
207
208 ddata->vm = *vm;
209 dssdev->panel.vm = *vm;
210
211 in->ops.dpi->set_timings(in, vm);
212 }
213
lb035q02_get_timings(struct omap_dss_device * dssdev,struct videomode * vm)214 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
215 struct videomode *vm)
216 {
217 struct panel_drv_data *ddata = to_panel_data(dssdev);
218
219 *vm = ddata->vm;
220 }
221
lb035q02_check_timings(struct omap_dss_device * dssdev,struct videomode * vm)222 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
223 struct videomode *vm)
224 {
225 struct panel_drv_data *ddata = to_panel_data(dssdev);
226 struct omap_dss_device *in = ddata->in;
227
228 return in->ops.dpi->check_timings(in, vm);
229 }
230
231 static struct omap_dss_driver lb035q02_ops = {
232 .connect = lb035q02_connect,
233 .disconnect = lb035q02_disconnect,
234
235 .enable = lb035q02_enable,
236 .disable = lb035q02_disable,
237
238 .set_timings = lb035q02_set_timings,
239 .get_timings = lb035q02_get_timings,
240 .check_timings = lb035q02_check_timings,
241 };
242
lb035q02_probe_of(struct spi_device * spi)243 static int lb035q02_probe_of(struct spi_device *spi)
244 {
245 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
246 struct gpio_desc *gpio;
247
248 gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
249 if (IS_ERR(gpio)) {
250 dev_err(&spi->dev, "failed to parse enable gpio\n");
251 return PTR_ERR(gpio);
252 }
253
254 ddata->enable_gpio = gpio;
255
256 return 0;
257 }
258
lb035q02_panel_spi_probe(struct spi_device * spi)259 static int lb035q02_panel_spi_probe(struct spi_device *spi)
260 {
261 struct panel_drv_data *ddata;
262 struct omap_dss_device *dssdev;
263 int r;
264
265 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
266 if (ddata == NULL)
267 return -ENOMEM;
268
269 dev_set_drvdata(&spi->dev, ddata);
270
271 ddata->spi = spi;
272
273 r = lb035q02_probe_of(spi);
274 if (r)
275 return r;
276
277 ddata->vm = lb035q02_vm;
278
279 dssdev = &ddata->dssdev;
280 dssdev->dev = &spi->dev;
281 dssdev->driver = &lb035q02_ops;
282 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
283 dssdev->owner = THIS_MODULE;
284 dssdev->panel.vm = ddata->vm;
285
286 r = omapdss_register_display(dssdev);
287 if (r) {
288 dev_err(&spi->dev, "Failed to register panel\n");
289 return r;
290 }
291
292 return 0;
293 }
294
lb035q02_panel_spi_remove(struct spi_device * spi)295 static int lb035q02_panel_spi_remove(struct spi_device *spi)
296 {
297 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
298 struct omap_dss_device *dssdev = &ddata->dssdev;
299
300 omapdss_unregister_display(dssdev);
301
302 lb035q02_disable(dssdev);
303 lb035q02_disconnect(dssdev);
304
305 return 0;
306 }
307
308 static const struct of_device_id lb035q02_of_match[] = {
309 { .compatible = "omapdss,lgphilips,lb035q02", },
310 {},
311 };
312
313 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
314
315 static struct spi_driver lb035q02_spi_driver = {
316 .probe = lb035q02_panel_spi_probe,
317 .remove = lb035q02_panel_spi_remove,
318 .driver = {
319 .name = "panel_lgphilips_lb035q02",
320 .of_match_table = lb035q02_of_match,
321 .suppress_bind_attrs = true,
322 },
323 };
324
325 module_spi_driver(lb035q02_spi_driver);
326
327 MODULE_ALIAS("spi:lgphilips,lb035q02");
328 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
329 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
330 MODULE_LICENSE("GPL");
331